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Nesterboy [21]
3 years ago
9

Which of these is an example of a chemical change?

Chemistry
2 answers:
Lady_Fox [76]3 years ago
6 0
The only one example of a chemical change would be:

B. Leaving cheese out to get moldy.

Because there is a chemical reaction.
julsineya [31]3 years ago
3 0

Answer:

(b) leaving cheese out to get moldy

Explanation:

i took the test

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What mass of powdered drink mix is needed to make a 0.5 M solution of 100 mL?
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Answer:

There is 17,114825 g of powdered drink mix needed

Explanation:

<u>Step 1 :</u> Calculate moles

As given, the concentration of the drink is 0.5 M, this means 0.5 mol / L

Since the volume is 100mL, we have to convert the concentration,

⇒0.5 / 1   =  x /0.1    ⇒ 0.5* 0.1  = x = 0.05 M

This means there is 0.05 mol per 100mL

e

<u>Step 2 </u>: calculate mass of the powdered drink

here we use the formula n (mole) = m(mass) / M (Molar mass)

⇒ since powdered drink mix is usually made of sucrose (C12H22O11) and has a molar mass of 342.2965 g/mol.

0.05 mol = mass / 342.2965 g/mol

To find the mass, we isolate it ⇒0.05 mol * 342.2965 g/mol = 17,114825g

There is 17,114825 g of powdered drink mix needed

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Which functional group will cause a compound to have a boiling point greater than that predicted only by molar mass?
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